满分5 >
初中数学试题 >
甲、乙、丙、丁四位选手各10次射击成绩的平均数都是8环,众数和方差如表,则这四人...
甲、乙、丙、丁四位选手各10次射击成绩的平均数都是8环,众数和方差如表,则这四人中水平发挥最稳定的是( )
选手 | 甲 | 乙 | 丙 | 丁 |
众数(环) | 9 | 8 | 8 | 10 |
方差(环2) | 0.035 | 0.015 | 0.025 | 0.27 |
A.甲
B.乙
C.丙
D.丁
考点分析:
相关试题推荐
已知一个等腰三角形两内角的度数之比为1:4,则这个等腰三角形顶角的度数为( )
A.20°或100°
B.120°
C.20°或120°
D.36°
查看答案
将如图所示的Rt△ABC绕直角边AC旋转一周,所得几何体的主视图是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118006_ST/images3.png)
D.
查看答案
下列图形中,是中心对称图形的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118005_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118005_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118005_ST/images2.png)
D.
查看答案
如图,点A、B、P为⊙O上的点,若∠PBO=15°,且PA∥OB,则∠AOB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118004_ST/images0.png)
A.15°
B.20°
C.30°
D.45°
查看答案
不等式组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118003_ST/0.png)
的解集在数轴上表示正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164818765311806/SYS201310221648187653118003_ST/images3.png)
D.
查看答案